Yes, you are eligible for NEET. Even though you didn't have Biology as a core subject, taking it as an additional subject in UP Board is sufficient to qualify for the exam.

Please note: While eligibility is based on having Biology as an additional subject, it's important to check the specific eligibility criteria set by the conducting authority (NTA) for that year. There might be additional requirements, such as minimum aggregate marks or specific subject combinations.

For more information about NEET Exam you can go through the link attached below.

https://medicine.careers360.com/exams/neet